For the polynomial f(x) = 2x^3 - x^2 + 19x - 12 determine the average rate of change between the two given values for x. Round to two decimal places.
x = -5, x = -4.5

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y